Tom wanted to be a teacher laster year.But now he has changed his mind.A.SO he did B.So he does c.So he has 为什么要用did而不 用has?怎样判断啊?

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Tom wanted to be a teacher laster year.But now he has changed his mind.A.SO he did B.So he does c.So he has 为什么要用did而不 用has?怎样判断啊?
Tom wanted to be a teacher laster year.But now he has changed his mind.
A.SO he did B.So he does c.So he has 为什么要用did而不 用has?怎样判断啊?

Tom wanted to be a teacher laster year.But now he has changed his mind.A.SO he did B.So he does c.So he has 为什么要用did而不 用has?怎样判断啊?
选A.SO he did他确实是这样的!
这个回答要根据说话者的话的意思,“TOM去年想当老师,但是现在他改变注意了.”说的主干是他“想当老师”这个话题,而这个话题是过去的时间点,所以要针对“wanted to ”.故SO he did正确.